Revert "Issue #2449445 by mortendk, alexpott, Cottser: Add "indentation" class back to indentation theme hook, use it for styling"

Broke table drag. :(

This reverts commit 4fd9ea47.

Issue #2457887 by prateekMehta, stefan.r, rpayanm, alexpott: Use Utility\SafeMarkup class instead of Utility\String for placeholder(), checkPlain(),format() functions

Issue #2449445 by mortendk, alexpott, Cottser: Add "indentation" class back to indentation theme hook, use it for styling

Issue #2399939 by DickJohnson, LewisNyman, mherchel, idebr, brahmjeet789: Refactor 'admin-panel' CSS component

Issue #2289917 by Wim Leers, mdrummond, lauriii, Manuel Garcia, emma.maria, Scionar, davidhernandez: Convert "messages" page element into blocks

Issue #2407725 by mortendk, sivaji@knackforge.com, rteijeiro, Manjit.Singh: Remove classes from system templates d*.html.twig

Issue #2407733 by mortendk, rteijeiro, sivaji@knackforge.com: Remove classes from system templates i*.html.twig

Issue #2407745 by mortendk, rteijeiro, sivaji@knackforge.com: Remove classes from system templates t*.html.twig

Issue #2407735 by mortendk, sivaji@knackforge.com, hussainweb: Remove classes from system templates m*.html.twig

Issue #2407743 by mortendk, danquah, rteijeiro, davidhernandez, sivaji@knackforge.com: Remove classes from system templates s*.html.twig

Issue #2407729 by sivaji@knackforge.com, mortendk: Remove classes from system templates h*.html.twig

Revert "Issue #2407735 by mortendk, sivaji@knackforge.com: Remove classes from system templates m*.html.twig"

This reverts commit 2b9b727c.

Issue #2407735 by mortendk, sivaji@knackforge.com: Remove classes from system templates m*.html.twig

Issue #2407715 by crowdcg, davidhernandez, mortendk, sivaji@knackforge.com, Manjit.Singh, dernetzjaeger: Remove classes from system templates b*.html.twig

Issue #2396553 by nripeshtrivedi, fullerja: field.html.twig documentation on template suggestions is incorrect

Issue #2306407 by lauriii, penyaskito, mortendk, pakmanlh, Wim Leers, ypogue: Remove breadcrumb from page template

Issue #2291449 by Cottser: Add Twig template inheritance based on the theme registry, enable adding Twig loaders

Issue #2336141 by lauriii, LewisNyman, rteijeiro, balagan, emma.maria, stefika: Create reusable color classes

Issue #2329753 by lauriii, davidhernandez, LewisNyman, nathandao: Move html classes from preprocess to templates

Issue #2217731 by crowdcg, lauriii, davidhernandez, aczietlow, jjcarrion, mortendk, karolus, pakmanlh, LewisNyman, aboros, joshua.boltz: Move field classes out of preprocess and into templates

Issue #1663166 by LewisNyman, Manuel Garcia, JamesLefrère, BarisW, sqndr, tompagabor: Clean up system admin css

Issue #2329763 by lauriii, Jens-0, Cottser, Sutharsan: Move links classes from preprocess to templates.

Issue #2329767 by lauriii, alexpott, Cottser, sqndr: Move table classes from preprocess to templates.

Issue #1623574 by droplet, cilefen, cesarmiquel, patrickfgoddard, sun, zaporylie, er.pushpinderrana, stevecowie, mbroere: Fixed Remove trailing space from form element labels and field labels (HTML nbsp).

Issue #2348783 by larowlan, Cottser, kugta | skein: Fixed drupal_set_message inherits previous style if set to 'status'.

Issue #2329901 by lanchez, lauriii | davidhernandez: Move form classes from preprocess to templates.

Issue #1946240 by eiriksm, David_Rothstein, Yaron Tal, madhusudanmca, rszrama: Remove the hardcoded 0 index in status-messages.html.twig.

Issue #2229435 by lauriii, joelpittet, Rade: Clean up the way attributes are printed in field.html.twig.

Revert "Issue #1842140 by mdrummond, tonystar, gavin.hughes, killerpoke, lauriii, droweski, stevector, omg-its-maggie, jenlampton, Renee S: Remove title and wrapper div from theme_item_list."

This reverts commit 79395676.

Issue #2329851 by lanchez, lauriii, Jolidog | davidhernandez: Move miscellaneous system classes from preprocess to templates.

Issue #1842140 by mdrummond, tonystar, gavin.hughes, killerpoke, lauriii, droweski, stevector, omg-its-maggie, jenlampton, Renee S: Remove title and wrapper div from theme_item_list.

Issue #2335003 by joshi.rohit100, rootwork, tuutti | joelpittet: Rename task-list.html.twig to maintenance-task-list.html.twig.

Issue #2329771 by davidhernandez, lauriii, pakmanlh: Move image classes from preprocess to templates.

Issue #1869476 by rteijeiro, LewisNyman, lauriii, Wim Leers, mdrummond, swentel, hosef, cbiggins, larowlan, sun, EclipseGc, Gábor Hojtsy: Convert global menus (primary links, secondary links) into blocks.

Issue #1912608 by Cottser, ckrina, jamesquinton, lauriii, jwilson3, mgifford, scaragucc' | criz: Update pagination markup for new CSS standards and improved accessibility.

Issue #1777332 by hass, Cottser, mike.roberts, joelpittet, dawehner | jenlampton: Replace theme_menu_link() and menu-tree.html.twig with a single Twig template.